人湿桡骨干的冲击压缩实验研究

目的　探讨人湿桡骨密质骨在不同应变率下的力学性能及其分布规律、对应变率的相关性和本构关系。方法　用分离式hopkinson压杆技术 (SHPB)对人湿桡骨密质骨进行了应变率分别在 ε =0 .6× 10 3 s-1和 ε =1.2× 10 3 s-1条件下的冲击压缩试验。结果　桡骨在高应变率下的力学性能随其轴向位置变化 ,呈现出中部强两端弱的分布 ,且非对称。桡骨的极限强度和压缩模量随应变率的提高而增大 ,在高应变率段尤为显著 ,而且表现出非线性粘弹性的力学行为。结论　在冲击压缩力下 ,桡骨的两端 ,尤其是远端容易骨折 ,并与时间有关。

Impact compressive experiment of human fresh radius compact

Objective To investigate the mechanical properties, distributing law, correlation to strain rate and constitutive relationship of human fresh radius compact. Methods Impact compressive experiment for human fresh radius compact bone at strain rate =0.6×10 3s -1 and =1.2×10 3s -1 by splis Hopkinson Pressure Bars (SHPB) were performed. Results The mechanical properties of the compact bones varied along the longitudinal direction; the ultimate stress, breaking strain and dynamic compressive modulus at middle section were stronger than those at both ends and were asymmetrical. The ultimate stress and dynamic compressive modulus rose as the strain rate rose, which was very obvious in the section of high strain rate. The radius assumed a monlinear elastic mechanial property. Conclusion Under impact compression the radius gets fractured easily at both ends, especially at distance section, and the fracture is related to time.